
class BootStrapForm(object):
    bootstrap_class_exclude=[]
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # super(RegisterModelForm,self).__init__(*args, **kwargs)
        for name, field in self.fields.items():
            if name in self.bootstrap_class_exclude: 
                continue
            old_class = field.widget.attrs.get('class', "")
            field.widget.attrs['class'] = '{} form-control'.format(old_class)
            # field.widget.attrs['class']='form-control'
            field.widget.attrs['placeholder']='请输入%s'%field.label
            field.widget.attrs['autocomplete']='new-password'   # forbidden browser autocomplete